[1]Г. П. Дубарь, "Анализ сланценосности России и сопредельных государств", PMI, т. 137, сс. 122-133, дек. 1993.

[1]G. P. Dubar, "Analysis of Shale Oil Shale Potential in Russia and Neighboring Countries", PMI, vol. 137, pp. 122-133, Dec. 1993.